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Math Help - Whole number and fraction multiplied by whole number and fraction

  1. #1
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    Whole number and fraction multiplied by whole number and fraction

    -1 and 3 over 4 multiplied by -1 and 2 over 5, I got 1 and 6 over 20 and my calculator says 1 and 9 over 20, how did it get that answer? I am confused
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  2. #2
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    Is this the problem?

    -1\frac{3}{4}\times -1\frac{2}{5}

    -\frac{7}{4}\times -\frac{7}{5}

    \frac{7\times 7}{4 \times 5} = \frac{49}{20} = 2\frac{9}{20}
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  3. #3
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    How do I do it?

    How do I do the problem itself? I have other problems like it
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  4. #4
    Senior Member Educated's Avatar
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    The easiest thing to do to solve these kind of problems is to turn it into one fraction, so you don't have a mixed fraction.

    -1\frac{3}{4} = \frac{-7}{4}

    Once you have done that, just multiply the numerator by the numerator and the denominator by the denominator.

    \frac{a}{b} \times \frac{c}{d} = \frac{a \times c}{b \times d}

    And then you will get your answer.
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